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Field Ionization Sources
Application of the FI Mass Spectrometer to Physico
Qualitative Analyses with the FI Mass Spectrometer
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acetone adsorbed adsorption analysis approximation atoms benzonitrile bond cathode chemisorption current-voltage curve discussed distance distribution electric field electron impact emission emitted emitter energy factor field desorption field dissociation field evaporation field ion field ionization field strength fragment peak function gas phase heptane high electric field increase ion current ion source ionization potential lens mass lines mass numbers mass spectra mass spectrometer maximum measured metal metastable metastable ions metastable peak micro needles microscope mixture molecular ion molecules n-heptane n-paraffins neutral normal metastable observed obtained occur parent ion intensity particle supply platinum platinum tips platinum wire polar positive charge potential curve pressure proton protrusions radicals rate constants ratio rearrangement reactions relative intensity resolving power sample sensitivity coefficients shifted shown in fig slit spectrum substances temperature thin wires threshold field tip surface Torr tungsten tungsten tips tunneling V/cm vibrational voltage whiskers Wollaston wire